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From Ben Laurie <...@algroup.co.uk>
Subject Re: bogus subs to mailing lists (more?)
Date Sun, 09 Nov 2003 17:08:22 GMT
Brian Behlendorf wrote:

> On Fri, 7 Nov 2003, Santiago Gala wrote:
> 
>>Classified for reading until I finish a proposal ;-)
>>
>>A nice scheme against spam, I read about some time ago, was about
>>requiring the email sender to compute a computationally difficult
>>challenge before the email was accepted, for uknown/untrusted senders,
>>something that could take 1 sec CPU time for a reasonable processor.
>>The idea was raising the cost of sending spam and putting it where it
>>belongs. Trusted senders, like the ASF, for instance, would not be
>>required to do it.
>>
>>So, a spammer would have to pay like 1 TeraInstruction per message, and
>>a reasonable PC would send no more than say 3000 spams per hour. This,
>>BTW, would make desirable to send signed messages for bulk senders,
>>since those would be much "cheaper" to send.
> 
> 
> Ouch.  Daedalus.apache.org sends out over 1M messages per day, and at
> bursty times 100 per second.  How do we convince a non-trivial number of
> hosts to trust us and not require that computation?

You require hash-cash for list postings and sign them for redistribution.

Cheers,

Ben.

-- 
http://www.apache-ssl.org/ben.html       http://www.thebunker.net/

"There is no limit to what a man can do or how far he can go if he
doesn't mind who gets the credit." - Robert Woodruff



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